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It depends a bit on you setup. Assuming you want to do this "inline"
on the box receiving the traffic. Then you should know/learn, that XDP
cannot allocate a new packet (that e.g. could be used sending
IPFIX/sFlow info directly). Instead, I would use the perf-ringbuffer
to store sampled-packets (via copy), and then code a userspace program
that reads from this perf-ringbuffer, and it will communicate with the
central IPFIX/sFlow server.

>Any samples for reference will be a great help.

From XDP howto use the perf-ringbuffer via bpf_perf_event_output,
samples are avail here:

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